Hydraulic jack



HYDRAULIC JACK Filed April 8, 1948 JNVENTOR. ER/CH l(. AMSGHUETZ ATTORNEYS.

Patented Jan. 29, 1952 UNITED" STATES 2 Claims. 1,

The present invention relates to; vehicle lacks of the hydraulic type and has among its objects the production of a jack ofthistype that is relatively simple inconstruction and operation as compared to known jacks of the same type.

Another object is to provide a jack that is less subject to leakage of the contained operating fluid-usually a suitable oil.

Another object is to provide a jack in which the load supporting stirrup may be easily and quickly adjusted to any one of a multiplicity of positions, utilizing a clutch and therefore not requiring previously prepared notches or definite locating means.

Another object is to greatly simplify the construction of the pump and oil retransfer means.

Still other objects and advantages will be apparent to those skilled in the art upon reference to the following description and the accompanying drawings in which Fig. 1 is a side elevation of the jack with parts being shown in vertical section.

Fig. 2' is a section on line 2--2 of Fig. 1.

Fig. 3 is a section on line 3-3 of Fig. 2.

Fig. 4 is a section on line 4-4 of Fig. 1.

Fig. 5is an enlargement of a part of Fig. 1 and a section on line 55 of Fig. 4.

As shown in the drawing, the jack comprises a base I upon which are vertically mounted concentric tubes II and I2 of such difierent diameters as to provide a space l3 constituting an oil reservoir.

The inner tube II is threaded into the base and is sufliciently long to project from the top of tube l2 and is threaded to receive a nut M, which is adapted to be screwed down upon a suitable cap l covering tube l2 and clamp the tubes and base together and provide fluid tight joints, suitable gaskets being used.

Slidably mounted in tube II is a piston l6 and piston rod H, the latter being sufiiciently long to project from the top of tube II when the piston 16 is adjacent the bottom, and to the top of red I! is fixed the member l8 forming part of the load carrying means.

The member [8 is preferably an eccentric disc and has welded to it the ends of a U-shaped element 20 consisting of an unhardened metal rod formed to a long narrow U with the sides parallel and of suificient length to extend toadjacent the base I 0 when the rod I1 is in its lowest position.

This element 20 carries a T-shaped stirrup member 2| the cross bar 21A of which is of substantial thickness vertically and which is provided. withqpassa es 22; loosely fitting-1 the arahen arszof; U member:

unloaded member 21 vertically on the rods, but application of a load will tilt the stirrup and cause the balls 23 to superficially penetrate the rods and prevent downward movement.

As indicated, the outer tube 12 constitutes the fiuid reservoir and the inner tube H, the power cylinder into which the oil is forced to elevate rod I! and the load carried thereby. The pump constituting the means for such forcing is part of the base In.

In Figs. 1, 2 and 3 the base In is provided with a horizontal passage 30 bored from an outer face of the base member across the axial line of tube II to terminate below the space [3, and having branch passages 3| and 32 leading respectively to space l3 and the interior, at the bottom, of tube II.

In branch passage 32 and opening upwardly is a ball valve 33 and in passage 36, between the branch passages, is a second ball valve 34 opening toward passage 32, being maintained in closed position by a spring 35. Also opening to passage 33 is a pump cylinder 36 in which is reciprocably mounted a piston 31 provided with suitable packing 38.

This piston 31 extends a short distance from the piston boss 39 and is connected to an extension 40 by means of a loose sleeve 4| and pins 42. The extension 40 at its upper end is pivotally connected to an operating handle 43 in turn pivotally connected to the cap I5 at the top of the tubes II and I 2.

The arrangement of passages, valves and pump cylinder 33 to 39, constitutes a pump adapted to force oil drawn from space l3 into tube I l to elevate the rod l1 and load and means is provided to retransfer the oil to space I 3 to permit lowering of the rod.

Such means is shown in Figs. 1, 2 and 3, and comprises a passage 53 bored from the outer face of base Ill into the branch passage 32 above valve 33. A branch 5| connects this passage 50 with the space I3 and a valve 52 is located between the branch 5! and the connection between passage 50 and passage 32. This valve opens toward the branch pasage 5| and is normally closed by means of a screw 53 extending to the outside of base l0 and operable by means of a suitable handle 54. The outer end of pas- In the: outer side; of; a h; passa e. 22 andz near the..bottom.: is. a: hard ned; steel ;ba1l23= so rran ed hat a; portion or the ball projectszintd-the passa e;

This construction permits easily moving the- 3 sage 30 is normally closed by means of a screw plug 60.

Now having described the invention and the preferred embodiment thereof, it is to be understood that said invention is to be limited not to the specific details herein set forth, but only by the scope of the claims which follow.

I claim:

1. A load supportfor vehicle jacks includin an upwardly movable power actuated rod, said support consisting'of a T-shaped stirrup member, the cross bar of which is provided with parallel vertical passages, each having a metallic ball set in the lower portion of its wall with a portion of the ball extending into the passage, and parallel bars loosely slidable in said passages, said bars being fixed at their upper ends to said rod.

2. A load support for jacks including an upwardly movable power actuated member, said load support comprising an unhardened steel rod depending from said member and a load engaging element carried by said rod, said load engaging element consisting of a horizontally arranged member provided with a vertical passage through which said rod loosely extends, a hardened steel element embedded in the wall of and projecting into said passage near the lower end thereof adjacent the surface of said rod but spaced therefrom a sufiicient distance to permit free sliding of the unloaded element.

ERICH K. ANSCHUETZ.

REFERENCES CITED 7 The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 383,710 Crecelius May 29, 1888 799,188 Reid Sept. 12, 1905 1,880,732 Bolens Oct. 4, 1932 1,904,115 Bacon Apr. 18, 1933 2,107,717 Smith Feb. 8, 1938 2,165,367 Gormley et a1. July 11, 1939 FOREIGN PATENTS Number Country Date 7 49,524 Sweden June 29, 1921 

